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Day Length

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Surface Gravity

Featured in...

Mass Effect 2 & Mass Effect 3

Population: 1,802,705,000

Orbital Distance: 0.07 AU (orbits Cerunnos)

Orbital Period: 21.5 Earth Hours (around Cerunnos)

Mass Effect 2

The hostile moon Caleston is the largest satellite of the gas giant Cernunnos. An ancient asteroid strike deposited major lodes of element zero within the molten sulfur mantle. Eldfell-Ashland Energy's mining operations have made it the largest source of starship drive core material in the Attican Traverse.

Caleston is wracked with volcanism due to tidal stresses from Cernunnos. Because of weak solar output, plant-like life on Caleston is not carbon-based and photosynthetic but silicon-based and thermosynthetic, requiring heat rather than sunlight to power its chemical reactions. These organisms flourish in volcanic vents and during solar flares, when Balor can double or triple in luminosity. Sadly, sapient habitation is not possible here, and Caleston's biodiversity is considered "threatened" by the Citadel Council Committee on Habitable Worlds.

Mass Effect 3

Population: 1.8 billion (All pop. estimates are pre-invasion)

TCaleston is the largest satellite of the gas giant Cernunnos. Ancient asteroid strikes deposited major lodes of element zero within the molten sulfur mantle. Eldfell-Ashland Energy's mining operations made it the largest source of starship drive core material in the Attican Traverse, which threatened Caleston's native biodiversity with industrial waste.

Caleston is wracked with volcanism due to tidal stresses from Cernunnos. Because of weak solar output, plant-like life on Caleston is not carbon-based and photosynthetic, but silicon-based and thermosynthetic, requiring heat rather than sunlight to power its chemical reactions. These organisms flourish in volcanic vents and during solar flares, when Balor, Caleson's sun, can double or triple in luminosity. Oxygen-breathing habitation is not possible outside its many domed cities. Those cities are now feasts for the Reapers, who drove off Caleston's protective fleet and now threaten to puncture domes to force the population into submission.